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浙江缙云县大洋山石鼓尖花岗岩坑穴成因
引用本文:朱诚,崔之久,李中轩,高洁,王立新,邬祥林,郑朝贵,沈庆凡,郑献章.浙江缙云县大洋山石鼓尖花岗岩坑穴成因[J].地理学报(英文版),2009,19(2):239-248.
作者姓名:朱诚  崔之久  李中轩  高洁  王立新  邬祥林  郑朝贵  沈庆凡  郑献章
作者单位:[1]School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China [2]School of Environment, Peking University, Beijing 100871, China [3]Zhejiang Institute of Geological Investigation, Xiaoshan 311203, Zhejiang, China [4]Department of Geography, Chuzhou College, Chuzhou 239012, Anhui, China [5]The People's Government of Jinyun County, Jinyun 321400, Zhejiang, China [6]Meteorological Bureau of Jinyun County, Jinyun 321400, Zhejiang, China
基金项目:Foundation: Regional landform and landscape survey programme of the Zhejiang Institute of Geological Survey
摘    要:

关 键 词:钾长花岗岩  缙云县  浙江省  顶部  X射线荧光光谱仪  末次盛冰期  成因  冰缘地貌
收稿时间:1 December 2005

On the genesis of granite pits on top of the Shigujian Peak of the Dayangshan Mountain in Jinyun County, Zhejiang Province
Cheng Zhu,Zhijiu Cui,Zhongxuan Li,Jie Gao,Lixin Wang,Xianglin Wu,Chaogui Zheng,Qingfan Shen,Xianzhang Zheng.On the genesis of granite pits on top of the Shigujian Peak of the Dayangshan Mountain in Jinyun County, Zhejiang Province[J].Journal of Geographical Sciences,2009,19(2):239-248.
Authors:Cheng Zhu  Zhijiu Cui  Zhongxuan Li  Jie Gao  Lixin Wang  Xianglin Wu  Chaogui Zheng  Qingfan Shen  Xianzhang Zheng
Institution:(1) School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210093, China;(2) School of Environment, Peking University, Beijing, 100871, China;(3) Zhejiang Institute of Geological Investigation, Xiaoshan, 311203, Zhejiang, China;(4) Department of Geography, Chuzhou College, Chuzhou, 239012, Anhui, China;(5) The People’s Government of Jinyun County, Jinyun, 321400, Zhejiang, China;(6) Meteorological Bureau of Jinyun County, Jinyun, 321400, Zhejiang, China
Abstract:On top of Shigujian Peak (1477 m a.s.l.) of the Dayangshan Mountain in Jinyun County, Zhejiang Province, large amounts of granite pits with diameters ranging from several dozens of centimeters to around one meter and depth from 10 cm to 45 cm are found on rock surface. These pits mainly appear on the NE and SE sides, and their drainage mouths are in the same direction. The identification results through micropolariscope and X-ray fluorescence spectrometer reveal that bedrock of pits is from middle to fine-grained moyite being apt to be weathered and modified. In Dayangshan region the annual mean temperature is 9.2°C and annual precipitation is over 1700 mm. On the one hand, there always experiences a period of periglacial action with temperature oscillating near 0°C for 4 months, i.e., from December to March next year. As a consequence, the freezing-thawing cycles may be remarkable to disintegrate the bedrock. On the other hand, the windward slope of Shigujian Peak meets typhoon of over force 10 on the Beaufort scale in summer, therefore, the blowing makes suspending sands or pebbles grind in swirling form. Based on field investigation and periglacial geomorphic theory, the pits on top of Shigujian Peak are attributed to freezing-thawing of periglacial action. Meanwhile, storm and strong wind accelerate the process. Observation shows that both the actions are still undergoing and variant directions of wind are the main cause for making different shapes of the pits. Because the top of Shigujian is 1500 m lower than the present snow line, some scholars considered that “glacial pothole” formed in the Quaternary is hard to work, even though in the Last Glacial Maximum (LGM). Foundation: Regional landform and landscape survey programme of the Zhejiang Institute of Geological Survey Author: Zhu Cheng (1954–), Professor, specialized in geomorphology and the Quaternary geology.
Keywords:the Shigujian Peak in Dayangshan Mountain  genesis of granite pits  wind-water erosion  freezing-thawing weathering
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